Closures for electromagnetic vibratory motors



Dec. 6, 1955 G. D. ALVORD CLOSURES FOR ELECTROMAGNETIC VIBRATORY MOTORS Filed Sept. 22, 1953 INVENTOR. GROVE D. ALVORD 1 1.: ATTORNEY United States Patent CLOSURES FOR ELECTROMAGNETIC VIBRATORY MOTORS Grove D. Alvord, Indiana, Pa., assignor to Syntron Company, Homer City, Pa., a corporation of Delaware Application September 22, 1953, Serial No. 381,666 7 Claims. (Cl. 310-49) This invention relates generally to electromagnetic vibratory conveyor motors and more particularly to the casing housing and enclosing such motors.

Electromagnetic motors of this character employ a series of leaf springs which form a stack and lie in flat contact with each other and are placed in the housing, which is a large hollow casting in the form of six faced box having aligned side windows which receive the opposite ends of the stack of springs. Clamping screws are provided in the windows to tightly clamp these springs in place. The intermediate portions of the stack of springs are embraced and clamped to an attaching member which extends forwardly through a front window in the casting to support the conveyor trough or other member to be vibrated by said motor. The back of the box casting has a pair of spaced rearwardly projecting supports which are not as wide as the side windows are from each other but provide a frame which is open from the top of the box and back around to the bottom of the box having the projections independent from each other. An electromagnetic field is adjustably mounted between these projections and the armature for this field is secured to the attaching member clamped to the springs and is thus supported in operative spaced relation with the electromagnetic field member.

Flat plate members enclose the side windows and the ends of the leaf springs out a single U-shaped plate encloses the complete electromagnetic motor by extending from the top around the projections to the bottom of the castings. All three of these cover plates are solid unitary plates that tightly seal with the casting to completely enclose and seal this portion of the box casting.

The attaching member which projects forwardly through the front window of the casting has an annular flange to receive one end of a flexible sleeve made of cloth or plastic, the other end of which is attached to the casting around the front window to completely seal the casting from dust and dirt and to permit oscillation of the armature and the attaching member.

With this structure the electromagnetic motor may be assembled and adjusted to properly operate and then be sealed in the housing preventing the entrance of any dirt or dust from accumulating in the electromagnetic motor and causing it to change its tuning and become otherwise nonoperative. When these magnetic motors are kept clean by such enclosures as comprise this invention they will continue to operate without requiring a retuning and will maintain their eflicient operation.

Other objects and advantages appear hereinafter in the following description and claims.

The accompanying drawing shows for the purpose of exemplification without limiting the invention or claims thereto certain practical embodiments illustrating the principles of this invention wherein:

Fig. 1 is a side elevation of a feeder broken away.

Fig. 2 is a plan view of the feeder motor with parts broken away.

motor with parts Fig. 3 is a front view of the feeder motor as shown in Fig. 2.

Fig. 4 is a front view of the structure shown in Fig. 1.

Referring to the drawings, the feeder trough 1 is supported at its front end by the spring 2 on the standard 3. The rear portion of the conveyor trough is provided with the spaced parallel reinforcing ribs 4 to which both sides of the vibratory connecting or attaching member 5 are secured. The attaching member is a casting that extends into the front window 6 of the box casting 7 and is clamped around the center of the multiple series of leaf springs 8 and 10, the ends of which project into the side windows 11 and 12 of the box casting 7. The springs are clamped to the attaching member by the screws 13 and they are clamped in windows 11 and 12 by the screws 14. Since the ends of the multiple springs 8 and 10 are clamped in the windows 11 and 12, their intermediate portion is the position of maximum flexure.

The electromagnetic armature 15 is also secured to the rear end of the vibratory connecting or attaching member 5 and is free to reciprocate therewith.

The rear face of the box casting is provide-:1 with the spaced projections 16 and 17 which are not as widely spaced as the sides of the box containing the windows 11 and 12. These projections 16 and 17 form a central open chamber or back space. Each projection is provided with aninwardly projecting flange 18 to which the core frame members 26 are attached to support the core 21, the same with its electramagnetic poles in operative spaced relation with the armature 15. The core 21 has two legs, each end of which forms the cooperating electromagnetic pole. Each leg carries a coil 22 which when energized by pulsating current intermittently attracts the armature 15 causing the springs to flex and draw back the conveyor. When the electrical impulse passes the armature is no longer attracted and the springs return it to its normal position. The springs are tuned by their size and selection to provide a natural frequency of vibration for the system that approximates but is not in syn chronism with the frequency of the driving current impulses.

The mounting of the electromagnetic motor 23 including the armature 15 and the core 21 with the coils 22 is completely open on three sides. This permits ease in assembling and adjusting the motor in the flanges 18.

The box casting 7 is supported on the spring feet 25 and the hanger 26 which comprises the transverse beam 27 having the spaced eyes 28 which may be connected to any suitable overhanging structure to support the motor. The beam is fabricated from spaced channel members connected together by a bottom plate 30. Eye bolts 31 are attached to the casting 7 by the bolts 32 and their stems pass upwardly through the plates 30 and the helical springs 33, the washer 34 and receive the nuts 35. The fore part of the conveyor also has the hook 36 which receives the spring hangers 37. Thus the whole of the conveyor is resiliently suspended on the springs 2, 25, 33 and 37 so that it may be free to reciprocate and convey material.

The front window 6 of the casting 7 through which the conveyor attaching member 5 extends is closed by the sleeve 40 made of flexible cloth, rubber, leather or other similar material. The outer end of the sleeve 40 is clamped and sealed with the casting 7 by the ring 41 bolted thereto. The inner end of the sleeve 40 is clamped and sealed to the conveyor attaching member 5 by the ring 42 bolted thereto. This flexible covering keeps the dirt from passing through the window 6 into the box casting.

The side windows 11 and 12 are each covered by the plates 43 and 44 which are bolted to the casting 7 and seal dirt from passing through these windows.

The three sided opening in the top and bottom of the box casting and around projections 16 and 17 are covered and sealed by one U-shaped plate 45 bolted to the projections and the top and bottom. Thus all of the windows are tightly closed and no dirt or dust can enter the box casting and interfere with the operation of the motor. Each of these plates and the sleeve can easily be removed to make any adjustments that may be required.

I claim:

1. A vibratory motor base comprising a hollow six faced box with its front face having a front window and its side faces having aligned side windows, leaf springs having their opposite ends clamped in said side windows, a frame projecting into said front window and clamped to the center of said leaf springs, an armature attached to the rear of said frame, the rear face of said box having spaced rearwardly extending projections forming the sides of the back window which extends around said projections from opposite positions in the top and bottom faces of the box, and an electromagnetic field member mounted between and within the dimensions of said spaced extending projections and in operative spaced relation with said armature.

2. The structure of claim 1 characterized in that a line between the starting positions of said rear window in the top and bottom faces of the box lies within the dimensions of said side oppositely disposed windows to expose the armature and electromagnetic field from the top around the back to the bottom.

3. The structure of claim 1 which also includes a marginal surface surrounding each of the front, back and side windows, a closure means for the marginal surface of the back and each side window, and flexible cover means enclosing said frame with said front window marginal surface to completely enclose said hollow base box.

4. The structure of claim 3 characterized in that the marginal surface surrounding said back window extends continuously around the rearwardly projecting supports and the top and bottom faces.

5. The structure of claim 1 characterized in that the rearwardly projecting supports are disposed inwardly of the side faces of the box.

6. A reciprocating electromagnetic vibratory motor comprising flexible spring means, an attaching member secured at the position of maximum fiexure of said spring means, a bracket on the outer end of said attaching member to secure it to the device to be reciprocated, an armature secured to the inner end of said attaching member, a massive base having a transverse pocket to support said spring means and having spaced rearwardy projecting sides forming a central open chamber exposing said armature, an electromagnetic field member supported between said sides in operative spaced relation to said armature, cover means having a flexible portion enclosing and sealing the flexible spring means with said attaching member and said base, and a U-shaped plate attached to said projecting sides to seal said armature and electromagnetic field member in said base.

7. A reciprocating electromagnetic vibratory motor comprising a hollow six faced box casting, a conveyor attaching member extending in sealed relation from the front of the box casting, spaced rearwardly projecting supports on the back of said box casting supporting an electromagnetic motor, and a U-shaped plate secured around said projection to completely enclose and seal the electromagnetic motor in the box casting.

References Cited in the file of this patent UNITED STATES PATENTS 1,238,666 Halbleib Aug. 28, 1917 1,965,382 Kluge July 3, 1934 2,161,342 Francis June 6, 1939 2,225,537 Johnson Dec. 17, 1940 2,444,134 Hittson June 29, 1948 2,581,806 McShirley Jan. 8, 1952 

